You can't turn up the luminosity on nebulas, but you can crank up the contrast between them and the night sky to reveal more of their wondrous detail. Our Oxygen-III filters provide extremely selective filtration to bring out elusive detail in diffuse and planetary nebulas. These filters do so by transmitting close to 90% of the light corresponding to the two oxygen-III spectral lines at 496nm and 501nm while completely blocking virtually all other visible wavelengths.

The results are remarkable. You'll see more detail than you ever could before in nebular gems such as the Swan, Ring, Dumbbell, Helix, and Eagle, to name a few. The O-III provides an even greater contrast boost on some objects than the UltraBlock narrowband filter. And for nebulas, every little bit helps! Try the O-III with a low-power 2" eyepiece and take in the whole Veil Nebula. Wow!

Due to the amount of light blockage, the O-III filter is recommended for telescopes of 8" aperture or greater, and for visual use only. It features the highest quality optical glass in a double-threaded, anodized aluminum cell.

Warranty
Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Hydrogen-Beta nebula filters are perhaps the only way to see the faint and elusive Horsehead, California, and Cocoon nebulae. These filters pass light that these faint nebulae emit. Best used with medium to large aperture telescopes in dark skies.

For cleaning the lenses in your telescope or binocular, the Orion Microfiber Optics Cleaning Cloth lifts dirt, fingerprints, water and oil from surface without scratching, streaking or smearing delicate lens surfaces. The cloth is machine washable.

Stratus eyepieces deliver a wide 68-degree apparent field of view which allows you to see much more than a typical 52-degree Plossl. 8-element optics yield sharp, high contrast views while generous eye relief provides a comfortable visual experience.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, & reviews, and even become a featured Orion customer!